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    Radiocarbon Dating of Groundwater in a Confined Aquifer in Southeast Arizona

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    Author
    Robertson, Frederick N.
    Issue Date
    1992-01-01
    
    Metadata
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    Citation
    Robertson, F. N. (1992). Radiocarbon dating of groundwater in a confined aquifer in southeast Arizona. Radiocarbon, 34(3), 664-676.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 14th International Radiocarbon Conference held in Tucson, AZ, May 20-24, 1991.
    URI
    http://hdl.handle.net/10150/653399
    DOI
    10.1017/S0033822200063955
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Radiocarbon, delta-13C and major-element data were used to construct a geochemical framework for interpretation of the hydrological flow system in the lower San Pedro basin, southeastern Arizona, USA. The 14C and major-element data show a regional confined aquifer that extends throughout most of the basin. Groundwater ages, after correcting for chemistry, are greater than 10 ka BP. The groundwater ages do not increase in a downvalley direction, the assumed direction of groundwater movement in most intermontane basins in the region, but along general flow paths normal to the mountains toward the center of the basin. Recharge to the confined aquifer originates from infiltration of precipitation and runoff near the alluvium-mountain contact along the Galiuro Mountains and is discharged by evapotranspiration along the center of the basin. The hydrogeological concept of the 14C model is supported by the water chemistry and by the mass transfer defined by the chemical model. Weathering of primary silicate minerals in the confined aquifer does not occur downvalley, but only along the direction of flow. Hydraulic conductivities calculated for the aquifer from 14C velocities are about an order of magnitude slower than those determined through hydrological methods. The lower hydraulic-conductivity values are attributed to a thick confining layer overlying the discharge area along the San Pedro River.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200063955
    Scopus Count
    Collections
    Radiocarbon, Volume 34, Number 3 (1992)

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